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| VC, M_(23)C_6 PRECIPITATES AND STRESS RUPTURE NOTCH SENSITIVITY IN GH36 SUPERALLOY |
| MIAO Baihe; XIE Xishan (Beijing University of Iron and steel Technology) |
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Cite this article:
MIAO Baihe; XIE Xishan (Beijing University of Iron and steel Technology). VC, M_(23)C_6 PRECIPITATES AND STRESS RUPTURE NOTCH SENSITIVITY IN GH36 SUPERALLOY. Acta Metall Sin, 1986, 22(1): 44-143.
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Abstract The TEM analysis of the microstructure of two GH36 superalloys undergone different regimes of heat treatment was conducted. The precipitates were identified as VC, M_(23)C_6 and NbC. The orientation relationship between the precipitates and γ matrix is shown as follows:[011]_(v C)//[011]_M//[011]_(M_(23)C_6)(111)_(v C)//(111)_M//(111)_(M_(23)C_6)(200)_(v C)//(200)_M//(200)_(M_(23)C_6)After normal heat treatment, the VC precipitates and distributes as fine dispersed particles of size from several to ten odd nm, and minimum ones are down to 2.8 nm alone examined by Moire pattern. The VC may coagulate and grow in a few nm larger and more M_(23)C_6 may precipitate along grain boundary after superimposed aging at elevated temperature. This microstructure and grain boundary precipitation may reduce the yield and stress rupture strengthes of the alloy, but improve the notch sensitivity of stress rupture test.
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Received: 18 January 1986
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2 《高温合金金相图谱》编写组,高温合金金相图谱,冶金工业出版社,北京,1979． p.67-69．
3 谢锡善;孙仙奇;高良;陈国良;袁志民;常蓬元;朱金元,第五届全国高温合金会议论文集,1983年.
4 Edington, J.W., practical electron microscopy in materials science, Vol. 3． Interpretation of transmission electron micrographs, Department of metallurgy and materials science, University of cambridge, England. 1974, p. 82-84．
5 Guttman, V., phase stability in high temperature alloys. Appl. Sci. Publ., London, 1981． , p 60．
6 谢锡善;苗柏和,蠕变、疲劳及其交互作用下GH36合金的显微结构,待发表.9 |
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